CIF-2827: Placeholder XF in product list component

[laurentiumagureanu]

Description

be able to insert an XF into the product list component to show content between products

Related Issue

CIF-2827

Motivation and Context

be able to insert an XF into the product list component to show content between products

How Has This Been Tested?

Unit tests. Manually

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes and the overall coverage did not decrease.
• [x] All unit tests pass on CircleCi.
• [x] I ran all tests locally and they pass.

[codecov[bot]]

Codecov Report

Merging #930 (962f798) into master (daa88fa) will decrease coverage by 0.13%. The diff coverage is 76.73%.

@@             Coverage Diff              @@
##             master     #930      +/-   ##
============================================
- Coverage     89.71%   89.57%   -0.14%     
- Complexity     2154     2172      +18     
============================================
  Files           347      352       +5     
  Lines          9673     9764      +91     
  Branches       1394     1405      +11     
============================================
+ Hits           8678     8746      +68     
- Misses          713      727      +14     
- Partials        282      291       +9     

Flag	Coverage Δ
integration	51.62% <27.50%> (-0.67%)	:arrow_down:
jest	86.55% <ø> (ø)
karma	95.33% <100.00%> (+<0.01%)	:arrow_up:
unittests	88.44% <73.00%> (-0.35%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ore/components/models/productlist/ProductList.java	50.00% <0.00%> (-50.00%)	:arrow_down:
...ommerce/core/examples/servlets/GraphqlServlet.java	88.65% <0.00%> (-2.83%)	:arrow_down:
...ents/CommerceExperienceFragmentsRetrieverImpl.java	65.38% <65.38%> (ø)
...servlets/ProductListXfStylesDataSourceServlet.java	70.00% <70.00%> (ø)
...nternal/servlets/AbstractProductListXfServlet.java	83.33% <83.33%> (ø)
...nternal/models/v1/productlist/ProductListImpl.java	92.20% <96.22%> (+1.00%)	:arrow_up:
...gment/CommerceExperienceFragmentContainerImpl.java	100.00% <100.00%> (ø)
...riencefragment/CommerceExperienceFragmentImpl.java	90.90% <100.00%> (+15.41%)	:arrow_up:
...ets/ProductListXfStylesRenderConditionServlet.java	100.00% <100.00%> (ø)
...oductcollection/clientlibs/js/productcollection.js	89.85% <100.00%> (+0.14%)	:arrow_up:

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[LSantha]

We may need an update for the readme and the examples project to show the cool new feature.